CN204987982U - Waste heat recovery device suitable for airflow dryer - Google Patents

Abstract

The utility model discloses a waste heat recovery device suitable for a hot air dryer. The device includes a hot air dryer with a wet material inlet at one end and a dry material outlet at the other end. The hot and humid exhaust gas outlet located at the wet material inlet of the hot air dryer is filtered by a dehumidifying fan and hot and humid exhaust gas. The device and the corresponding connecting pipes are connected to the air inlet of the heat pipe heat exchanger, and the air outlet of the heat pipe heat exchanger passes through the dry air induced fan and the corresponding connecting pipes to the supplementary air outlet located at the outlet end of the dry material of the hot air dryer. connected. The utility model can reduce the heat required for heating the fresh air in the hot air dryer, reduce production and operation costs, and realize energy saving and emission reduction.

Description

A waste heat recovery device suitable for hot air dryer

technical field

The utility model relates to a waste heat recovery device of a hot air dryer suitable for the textile industry.

technical background

The hot air dryer is widely used in the drying of non-woven fabrics, loose fibers and knitted fabrics. With the rise of energy costs and the improvement of environmental protection requirements, the work of energy saving, consumption reduction and emission reduction is becoming more and more urgent and important. The working temperature of the hot air dryer is 130~180℃, and the exhaust gas temperature is about 80~120℃. Exhaust gas is composed of dry air and water vapor, and the heat taken away is divided into damp heat and latent heat of vaporization, and damp heat accounts for about 20% of the total heat. Exhaust gas is discharged directly, resulting in a huge waste of heat.

Contents of the invention

The purpose of this utility model is to provide a waste heat recovery device suitable for hot air dryers in view of the deficiencies in the above-mentioned prior art. The utility model can be widely used in the hot air drying machine of the production line of non-woven fabric, loose fiber and knitted fabric. It has the advantages of high efficiency, low cost and simple operation, and can be automatically controlled by the control system of the production line.

The purpose of this utility model can be achieved through the following technical measures:

The waste heat recovery device suitable for the hot air dryer of the utility model includes a hot air dryer with a wet material inlet at one end and a dry material outlet at the other end, located at the end of the wet material inlet of the hot air dryer The hot and humid exhaust gas outlet is connected to the air inlet of the heat pipe heat exchanger through the humidity exhaust fan, the hot and humid exhaust gas filter and the corresponding connecting pipeline, and the air outlet of the heat pipe heat exchanger is connected to the dry air induced fan and the corresponding connecting pipeline It is connected with the supplementary air outlet located at the outlet end of the dry material of the hot air dryer.

The heat pipe heat exchanger described in the utility model is composed of upper and lower partitions connected by heat pipes. Each of the upper and lower partitions has a set of inlets and outlets. The upper partition preheats the fresh air filtered by the fresh air filter, and the lower partition The exhaust gas is discharged after secondary utilization of waste heat. The heat pipe in the heat pipe heat exchanger is composed of a tube shell and a working medium. One end of the heat pipe is the evaporation section, and the other end is the condensation section; the evaporation section absorbs the heat of the hot fluid and transfers the heat to the working fluid (liquid state). After absorbing heat, it turns into steam in the form of evaporation and boiling, and flows to the condensation section under the action of a small pressure difference. At the same time, it condenses into a liquid and releases the latent heat of vaporization, which is passed to the cold fluid. The condensate is returned to the evaporation section by gravity. While the working fluid circulates in this way, heat is transferred from one end to the other. Its function is to enter the hot and humid waste gas discharged by the hot air dryer and the dehumidification fan into the heat pipe heat exchanger, so that the humid air in the waste gas is discharged, and the waste heat preheats the fresh air, reducing the energy used to heat this part of the air. consumption.

In the utility model, a temperature measuring device is provided on the connecting pipe between the hot and humid waste gas outlet and the air inlet of the heat pipe heat exchanger, which can measure and monitor the temperature of each part of the pipe as required.

The over-humid heat waste gas filter provided in the utility model can effectively clean the fibers in the hot air dryer and enter the heat pipe heat exchanger through the pipeline to prevent blockage. Pipes are sealed and connected to prevent hot and humid air from escaping.

The working principle of the utility model is as follows:

When the humidity exhaust fan of the hot air dryer draws the hot and humid exhaust gas from the hot air dryer, it enters the hot end of the heat pipe heat exchanger through the hot and humid exhaust filter, and is discharged to the atmosphere after heat exchange and cooling; the fresh air is Under the action of the dry air induced draft fan, the dry air pipe will be heated through the fresh air filter and the cold end of the heat pipe heat exchanger, and then sent to the supplementary air outlet of the hot air dryer, and then enters the hot air dryer to reduce the temperature of the hot air dryer. The heat required for heating fresh air inside reduces production and operation costs and achieves energy saving and emission reduction.

The beneficial effects of the utility model are as follows:

1. Strong versatility, this device can be widely used in hot air dryers of non-woven fabrics, loose fibers and knitted fabric production lines;

2. High efficiency, using high-efficiency heat exchange technology to recover the heat in the exhaust gas;

3. Low cost, reasonable system design and structure, effectively reducing operating costs;

4. The operation is simple and can be automatically controlled by the production line control system.

Description of drawings

Fig. 1 is a schematic diagram of the utility model.

Serial numbers in the figure: 1. Hot air dryer, 2. Humidity exhaust fan, 3. Humid and hot exhaust gas filter, 4. Heat pipe heat exchanger, 5. Dry air induced fan, 6. Fresh air filter, 7. Valve, 8 , Supplementary air outlet, 9, hot and humid exhaust gas discharge outlet.

detailed description

The utility model will be further described below in conjunction with embodiment (accompanying drawing):

As shown in Figure 1, the waste heat recovery device suitable for hot air dryers of the present utility model includes a hot air dryer 1 with a wet material inlet at one end and a dry material outlet at the other end. The hot and humid waste gas discharge port at the feed port of the machine wet material is connected to the air inlet of the heat pipe heat exchanger 4 through the humidity exhaust fan 2, the hot and humid waste gas filter 3 and the corresponding connecting pipeline, and the air outlet of the heat pipe heat exchanger 4 Through the dry air induced fan 5, the valve 7 and the corresponding connecting pipeline, it is connected with the supplementary air port located at the discharge port of the dry material of the hot air dryer.

The heat pipe heat exchanger 4 described in the utility model is composed of upper and lower partitions connected by heat pipes. The upper and lower partitions each have a group of inlets and outlets. The upper partition preheats the fresh air filtered by the fresh air filter 6. In the lower partition, the exhaust gas is discharged after secondary utilization of waste heat. The heat pipe in the heat pipe heat exchanger is composed of a tube shell and a working medium. One end of the heat pipe is the evaporation section, and the other end is the condensation section; the evaporation section absorbs the heat of the hot fluid and transfers the heat to the working fluid (liquid state). After absorbing heat, it turns into steam in the form of evaporation and boiling, and flows to the condensation section under the action of a small pressure difference. At the same time, it condenses into a liquid and releases the latent heat of vaporization, which is passed to the cold fluid. The condensate is returned to the evaporation section by gravity. While the working fluid circulates in this way, heat is transferred from one end to the other. Its function is to enter the hot and humid waste gas discharged by the hot air dryer and the dehumidification fan into the heat pipe heat exchanger, so that the humid air in the waste gas is discharged, and the waste heat preheats the fresh air, reducing the energy used to heat this part of the air. consumption.

In the utility model, a temperature measuring device is provided on the connecting pipe between the hot and humid waste gas outlet and the air inlet of the heat pipe heat exchanger, which can measure and monitor the temperature of each part of the pipe as required.

The filter provided in the utility model can effectively clean the fibers in the hot air dryer and enter the heat pipe heat exchanger through the pipeline to prevent blockage. Pipes are sealed and connected to prevent hot and humid air from escaping.

The main technical parameters of the utility model are as follows:

Dry air induced draft fan (frequency conversion motor) power: 7.5KW; heat transfer efficiency of heat pipe heat exchanger: 70%; fresh air temperature: about 25°C; preheated fresh air temperature: about 75°C.

Claims (3)

1. one kind is applicable to the waste-heat recovery device of airflow dryer, it is characterized in that: it comprises one end is provided with wet stock charging aperture, the other end is provided with dry material discharging opening airflow dryer, the damp and hot Waste gas outlet being positioned at airflow dryer wet stock feed inlet end is connected with the air inlet of heat-pipe heat exchanger by wet-emitting blower, damp and hot waste gas filter and corresponding connecting pipe, and the air outlet of heat-pipe heat exchanger is connected with the wind-supplying mouth being positioned at airflow dryer dry material discharge port end by dry air air-introduced machine and corresponding connecting pipe.

2. the waste-heat recovery device being applicable to airflow dryer according to claim 1, it is characterized in that: described heat-pipe heat exchanger is made up of two subregions be up and down communicated with by heat pipe, upper and lower two subregions respectively have one group of import and outlet, upper subregion is to the fresh air preheating after new wind filter filters, and lower subregion carries out discharging after waste heat secondary utilizes to waste gas.

3. the waste-heat recovery device being applicable to airflow dryer according to claim 1, is characterized in that: the connecting pipe between described damp and hot Waste gas outlet and the air inlet of heat-pipe heat exchanger is provided with temperature measuring equipment.